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Vibro-Acoustic Characterisation Laboratory<img alt="" src="http://webtest.cira.it/PublishingImages/Fig_iniziale.jpg" style="BORDER:0px solid;" />https://www.cira.it/en/research-infrastructures/vibro-acoustic-characterisation-laboratory/Vibro-Acoustic Characterisation LaboratoryVibro-Acoustic Characterisation Laboratory<h3>Description and operational capabilities</h3><p style="text-align:justify;">The EVAL laboratory skills allow CIRA to provide support to the Italian aerospace industry in numerical and experimental tests for research or service activities devoted to vibro-acoustic development and characterization of aeronautical and space structures and the experimental validation of passive and active control systems of vibration and noise and SHM systems. The main activities of the laboratory are described below :</p><ul><li>Development of Virtual Passenger models, by using Artificial Neural Networks, and execution of experimental tests (jury tests) in mock-up to evaluate the subjective vibro-acoustic comfort. Applications are in aerospace, automotive and rail field.<br></li><li>Development of Structural Health Monitoring systems (SHM) able to provide information on structural integrity of a component, identify and assess the existence and propagation of structural damage. The availability of a SHM system allows an improvement of the structure in terms of safety and performance. Moreover, the capability of such a system to early detection of damage onset, allows designing to "low-weight", by using higher design allowable.<br></li><li>Design and development of passive systems based on acoustic antennas and beamforming techniques for spatial localization of still or moving noise sources. They are used to locate and classify acoustic sources of equipment, in pass-by-noise and fly-over tests, for monitoring and surveillance systems, for recognition and guidance of manned and unmanned aircraft.<br></li><li>Experimental dynamic characterization (GVT) of full-scale complex structures and components.<br></li><li>Simulation of vibration environments in laboratory and evaluation of dynamic response in order to qualify structures and components during design and to test them against standards<br></li></ul><h3>Tools and Experimental Laboratories</h3><p><span style="text-align:justify;">EVAL Laboratory provides following test facilities and devices:</span><br><strong style="color:#0072c6;font-family:"segoe ui semilight", "segoe ui", segoe, tahoma, helvetica, arial, sans-serif;font-size:1.46em;"></strong></p><ul><li><span lang="EN-GB" style="text-decoration:underline;">Vibrating Table TIRA 59335-440</span></li></ul><ul><ul><li>Nominal Force: 35 kN (sine e random)</li><li>Nominal Force: 70 kN (shock)</li><li>Frequency range: 0 – 2000 Hz </li><li>Max Acceleration: 100 g (sine e random)</li><li>Max Acceleration: 200 g (shock) </li><li>Displacement (peak-peak): 50.8 mm</li><li>Maximum Test Article Weight: 600 kg</li></ul></ul><ul><li><span lang="EN-US" style="text-decoration:underline;">3D Surround Sound Ambisonic System</span></li></ul><ul><ul><li>Soundfield Microphone ST250</li><li>8 loudspeaker midrange QUESTED</li><li>1 sub-woofer JBL</li><li>Power: 4500 Watt rms</li></ul></ul><ul><li><span lang="EN-US" style="text-decoration:underline;">Semi-anechoic Chamber</span></li></ul><ul><ul><li>145 m<sup>3</sup>  volume</li><li>90 Hz cut-off frequency</li></ul></ul><ul><li><span lang="EN-US" style="text-decoration:underline;">SIEMENS - LMS Test Lab SW</span></li><ul><li>100  ICP measurement channels</li><li>8 output channels</li><li>SW TestLab  for  vibro-acoustic characterization</li><li><span lang="EN-US" style="text-decoration:underline;">Laser Vibrometer POLYTEC (</span>OFV-552 Sensor Head + OFV-5000 Controller)</li></ul></ul><ul><ul><li>Laser type:               Helium Neon (HeNe) </li><li>Laser class:               Class 2, < 1 mW, eye-safe </li><li>Laser wavelength: 633 nm, visible red laser beam </li><li>Focus:                        Manual focus</li></ul></ul><ul><li><span lang="EN-GB" style="text-decoration:underline;">Intensimetric System MICROFLOWN with PU probe and scan&paint software</span></li></ul><ul><ul><li>Frequency range 20Hz - 20kHz</li><li>Low susceptibility to background noise and reflections</li><li>No need for anechoic conditions</li><li>High resolution mapping of:</li><li>Sound pressure</li><li>Particle velocity</li><li>Sound intensity</li><li>Sound Power calculation</li></ul></ul><ul><li><span lang="EN-GB" style="text-decoration:underline;">Multifunction DAQ NI USB-6366</span></li><ul><li>8 analog simultaneous inputs a 2 MS/s/ch with 16-bit resolution</li><li>2 analog outputs, 3,33 MS/s, 16-bit resolution, ±10 V</li><li>24 I/O digital with max sincr. velocity of 1MHz</li><li>BNC connectors and connecting cable to PC</li><li>MATLAB (Data Acquisition Toolbox) and LabView compatibility</li></ul></ul><h3>Instrumentation:<br></h3><ul><li>Semi-anechoic Chamber</li><li>3D Surround Sound Ambisonic System </li><li>Small  anechoic chamber  for Insertion Loss </li><li>Vibrating Table</li><li>SIEMENS - LMS Test Lab SW</li><li>SIEMENS LMS SCADASIII HW</li><li>Electrodynamic shakers</li><li>Uniaxial and triaxial accelerometers </li><li>Load cells</li><li>Acoustic intensimetry system</li><li>Omnidirectional microphones and sound source</li><li>Laser vibrometer</li><li>Multifunction DAQ</li></ul><h3>Measurement Techniques</h3><ul><li>Tecniche di caratterizzazione basate su phase resonance and phase separation<br></li><li>Tecnica Ambisonic Surround<br></li><li>Tecniche di localizzazione di sorgenti di rumore basate su Beamforming and Intensimetry technique for noise source localization<br></li><li>Misura del Time of Flight di onde ultrasoniche<br></li></ul><h3>Customers</h3><p>ASI, ESA, MIUR, AVIO SpA, Alenia Aermacchi, Piaggio Aerospace, Airbus, Geven</p><h3>Partners</h3><p>UNINA, POLIMI; Siemens LMS, D'Appolonia, MSC Nastran, FCA, CRF, Leonardo, Geven</p><p style="text-align:justify;">The EVAL laboratory skills allow CIRA to provide support to the Italian aerospace industry in numerical and experimental tests for research or service activities devoted to vibro-acoustic development and characterization of aeronautical and space structures and the experimental validation of passive and active control systems of vibration and noise and SHM systems. The main activities of the laboratory are described below :</p><ul><li>Development of Virtual Passenger models, by using Artificial Neural Networks, and execution of experimental tests (jury tests) in mock-up to evaluate the subjective vibro-acoustic comfort. Applications are in aerospace, automotive and rail field.<br></li><li>Development of Structural Health Monitoring systems (SHM) able to provide information on structural integrity of a component, identify and assess the existence and propagation of structural damage. The availability of a SHM system allows an improvement of the structure in terms of safety and performance. Moreover, the capability of such a system to early detection of damage onset, allows designing to "low-weight", by using higher design allowable.<br></li><li>Design and development of passive systems based on acoustic antennas and beamforming techniques for spatial localization of still or moving noise sources. They are used to locate and classify acoustic sources of equipment, in pass-by-noise and fly-over tests, for monitoring and surveillance systems, for recognition and guidance of manned and unmanned aircraft.<br></li><li>Experimental dynamic characterization (GVT) of full-scale complex structures and components.<br></li><li>Simulation of vibration environments in laboratory and evaluation of dynamic response in order to qualify structures and components during design and to test them against standards</li></ul><p><span style="text-align:justify;">EVAL Laboratory provides following test facilities and devices:</span><br><strong style="color:#0072c6;font-family:"segoe ui semilight", "segoe ui", segoe, tahoma, helvetica, arial, sans-serif;font-size:1.46em;"></strong></p><ul><li><span lang="EN-GB" style="text-decoration-line:underline;">Vibrating Table TIRA 59335-440</span></li></ul><ul><li>Nominal Force: 35 kN (sine e random)</li><li>Nominal Force: 70 kN (shock)</li><li>Frequency range: 0 – 2000 Hz</li><li>Max Acceleration: 100 g (sine e random)</li><li>Max Acceleration: 200 g (shock)</li><li>Displacement (peak-peak): 50.8 mm</li><li>Maximum Test Article Weight: 600 kg</li></ul><ul><li><span lang="EN-US" style="text-decoration-line:underline;">3D Surround Sound Ambisonic System</span></li></ul><ul><li>Soundfield Microphone ST250</li><li>8 loudspeaker midrange QUESTED</li><li>1 sub-woofer JBL</li><li>Power: 4500 Watt rms</li></ul><ul><li><span lang="EN-US" style="text-decoration-line:underline;">Semi-anechoic Chamber</span></li></ul><ul><li>145 m<sup>3</sup>  volume</li><li>90 Hz cut-off frequency</li></ul><ul><li><span lang="EN-US" style="text-decoration-line:underline;">SIEMENS - LMS Test Lab SW</span></li><ul><li>100  ICP measurement channels</li><li>8 output channels</li><li>SW TestLab  for  vibro-acoustic characterization</li><li><span lang="EN-US" style="text-decoration-line:underline;">Laser Vibrometer POLYTEC (</span>OFV-552 Sensor Head + OFV-5000 Controller)</li></ul></ul><ul><li>Laser type:               Helium Neon (HeNe)</li><li>Laser class:               Class 2, < 1 mW, eye-safe</li><li>Laser wavelength: 633 nm, visible red laser beam</li><li>Focus:                        Manual focus</li></ul><ul><li><span lang="EN-GB" style="text-decoration-line:underline;">Intensimetric System MICROFLOWN with PU probe and scan&paint software</span></li></ul><ul><li>Frequency range 20Hz - 20kHz</li><li>Low susceptibility to background noise and reflections</li><li>No need for anechoic conditions</li><li>High resolution mapping of:</li><li>Sound pressure</li><li>Particle velocity</li><li>Sound intensity</li><li>Sound Power calculation</li></ul><ul><li><span lang="EN-GB" style="text-decoration-line:underline;">Multifunction DAQ NI USB-6366</span></li><ul><li>8 analog simultaneous inputs a 2 MS/s/ch with 16-bit resolution</li><li>2 analog outputs, 3,33 MS/s, 16-bit resolution, ±10 V</li><li>24 I/O digital with max sincr. velocity of 1MHz</li><li>BNC connectors and connecting cable to PC</li><li>MATLAB (Data Acquisition Toolbox) and LabView compatibility</li></ul></ul><h3>Instrumentation:<br></h3><ul><li>Semi-anechoic Chamber</li><li>3D Surround Sound Ambisonic System</li><li>Small  anechoic chamber  for Insertion Loss</li><li>Vibrating Table</li><li>SIEMENS - LMS Test Lab SW</li><li>SIEMENS LMS SCADASIII HW</li><li>Electrodynamic shakers</li><li>Uniaxial and triaxial accelerometers</li><li>Load cells</li><li>Acoustic intensimetry system</li><li>Omnidirectional microphones and sound source</li><li>Laser vibrometer</li><li>Multifunction DAQ.</li></ul><h3>Measurement Techniques</h3><ul><li>Tecniche di caratterizzazione basate su phase resonance and phase separation<br></li><li>Tecnica Ambisonic Surround<br></li><li>Tecniche di localizzazione di sorgenti di rumore basate su Beamforming and Intensimetry technique for noise source localization<br></li><li>Misura del Time of Flight di onde ultrasoniche.</li></ul><p>​UNINA, POLIMI; Siemens LMS, D'Appolonia, MSC Nastran, FCA, CRF, Leonardo, Geven</p><p>​ASI, ESA, MIUR, AVIO SpA, Alenia Aermacchi, Piaggio Aerospace, Airbus, Geven</p>

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Sviluppo di modelli di Passeggero Virtuale, basati sulle Reti Neurali Artificiali, e conduzione di test (jury test) per la determinazione del comfort vibro-acustico. Le applicazioni interessano il campo aerospaziale, automobilistico e ferroviariohttps://www.cira.it/PublishingImages/Forms/DispForm.aspx?ID=272Sviluppo di modelli di Passeggero Virtuale, basati sulle Reti Neurali Artificiali, e conduzione di test (jury test) per la determinazione del comfort vibro-acustico. Le applicazioni interessano il campo aerospaziale, automobilistico e ferroviarioImagehttps://www.cira.it/PublishingImages/Comfort.jpg
Fig_inizialehttps://www.cira.it/PublishingImages/Forms/DispForm.aspx?ID=273Fig_inizialeImagehttps://www.cira.it/PublishingImages/Fig_iniziale.jpg
Progettazione e sviluppo di sistemi passivi basati su antenne acustiche e tecniche di beamforming per la localizzazione spaziale di sorgenti di rumore ferme o in movimento.https://www.cira.it/PublishingImages/Forms/DispForm.aspx?ID=274Progettazione e sviluppo di sistemi passivi basati su antenne acustiche e tecniche di beamforming per la localizzazione spaziale di sorgenti di rumore ferme o in movimento.Imagehttps://www.cira.it/PublishingImages/Guardian.jpg
Sviluppo di sistemi di Structural Health Monitoring (SHM), capaci di fornire informazioni sull’integrità strutturale di un componente e identificare e valutare l’insorgenza e la propagazione di un danno strutturale.https://www.cira.it/PublishingImages/Forms/DispForm.aspx?ID=276Sviluppo di sistemi di Structural Health Monitoring (SHM), capaci di fornire informazioni sull’integrità strutturale di un componente e identificare e valutare l’insorgenza e la propagazione di un danno strutturale.Imagehttps://www.cira.it/PublishingImages/SHM.jpg

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